Based on some measurements, and comparison between YSS and Ohlins specs: - Length: 325mm - 327.5mm - Spring: 100N - Top eye mount: M10 - 30mm width - Bottom loop mount: M10 - 36~37mm width
There is a chance that GSR and GSXS shocks are directly compatible.
The bottom joint is the reason shock swap is difficult, because it seems only Suzuki makes the loop bracket at such dimension. - The more common ones are M10x30 found on Suzuki and older Kawasaki or M12x30 found on some Yamaha's.
Hence, by looking at some parts diagrams, I am able to determine which GSXR models are having similar bottom joint dimension. - We want the adjustability, and serviceable design of these shocks, be it Kayaba or Showa. - ebay have lots of these for under $100 shipped.
Pay attention to the needle bearing code, for example 17x24x32, with the last number showing the width of the bearing.
Based on the above, I looked for Ohlins shocks for GSXR1000 for 2007/2008, and found SU638 and SU788. - Unfortunately, I could not locate the spareparts list for either of these two models, to determine the width of the loop mount. - These two models come with 105N springs, so I believe they are close to the OE spring rate of GSXS750 of 100N. - However, the shock length indicated are 315~316mm, which makes them 10~12mm shorter. - If anyone decides to pursue this, please make measurements of the rear height (unladen rear load with an engine jack) before removing the stock shocks, measure length of both shocks before mounting. - It is easier to shim a shorter shock to get the same rear height. The shim, or washer, is usually added between the top shock mount and the frame (a more difficult task as it require removing more parts of the bike). - The rear height is important, as it affects front bias-ness, and too 'lazy' front end can lead to high speed wobbles or unintentional wheelies.
Anyone can look for GSXR1300 or other shocks with loop mounts, using lower bearing of ~32mm width as a potential candidate of shock swap.